1
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Li B, Li J, Chen S, Yuan Q, Fang C, Gan W. Monitoring the response of a model protocell to dye and surfactant molecules through second harmonic generation and fluorescence imaging. Phys Chem Chem Phys 2024; 26:8148-8157. [PMID: 38380536 DOI: 10.1039/d4cp00009a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Probing the interaction between molecules and protocells is crucial for understanding the passive transport of functional molecules in and out of artificial and real cells. Second-harmonic generation (SHG) has been proven to be a powerful method for analyzing the adsorption and cross-membrane transport of molecules on lipid bilayers. In this study, we used SHG and two-photon fluorescence (TPF) imaging to study the interaction of charged dye molecules (D289) with a lipid vesicle. Unexpectedly, it was observed that the transport of D289 at a relatively high concentration is not as efficient as that at a lower dye concentration. Periodic shrinking of the model protocell and discharging of D289 out from the vesicle were revealed by combined analyses of SHG and TPF images. The response of the vesicle to a surfactant was also analyzed with D289 as a probe. This work demonstrates that the combined SHG and TPF imaging method is a unique approach that can provide detailed information on the interaction of molecules and lipids (both morphology and molecular kinetics). Determining these subtle interfacial kinetics in molecules is important for understanding the mechanism of many biophysical processes occurring on lipids.
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Affiliation(s)
- Bifei Li
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
| | - Jianhui Li
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
| | - Shujiao Chen
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
| | - Qunhui Yuan
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
| | - Chao Fang
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
| | - Wei Gan
- Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
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2
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Iwabuchi S, Nomura SIM, Sato Y. Surfactant-Assisted Purification of Hydrophobic DNA Nanostructures. Chembiochem 2023; 24:e202200568. [PMID: 36470849 DOI: 10.1002/cbic.202200568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/04/2022] [Accepted: 12/05/2022] [Indexed: 12/12/2022]
Abstract
Purification of functional DNA nanostructures is an essential step in achieving intended functions because misfolded structures and the remaining free DNA strands in a solution can interact and affect their behavior. However, due to hydrophobicity-mediated aggregation, it is difficult to purify DNA nanostructures modified with hydrophobic molecules by conventional methods. Herein, we report the purification of cholesterol-modified DNA nanostructures by using a novel surfactant-assisted gel extraction. The addition of sodium cholate (SC) to the sample solution before structure folding prevented aggregation; this was confirmed by gel electrophoresis. We also found that adding sodium dodecyl sulfate (SDS) to the sample inhibited structural folding. The cholesterol-modified DNA nanostructures prepared with SC were successfully purified by gel extraction, and their ability to bind to the lipid membrane surfaces was maintained. This method will facilitate the purification of DNA nanostructures modified with hydrophobic molecules and expand their applicability in the construction of artificial cell-like systems.
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Affiliation(s)
- Shoji Iwabuchi
- Department of Robotics, Tohoku University, 6-6-01 Aramaki Aoba-ku, Sendai, 980-0845, Japan
| | - Shin-Ichiro M Nomura
- Department of Robotics, Tohoku University, 6-6-01 Aramaki Aoba-ku, Sendai, 980-0845, Japan
| | - Yusuke Sato
- Department of Intelligent and Control Systems, Kyushu Institute of Technology, 680-4 kawazu, lizuka, 820-8502, Japan
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3
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Speer D, Ho JCS, Parikh AN. Surfactant-Mediated Solubilization of Myelin Figures: A Multistep Morphological Cascade. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8805-8816. [PMID: 35816731 PMCID: PMC9979658 DOI: 10.1021/acs.langmuir.2c00774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Lamellar mesophases of insoluble lipids are readily solubilized by the micellar mesophases of soluble surfactants. This simple process underscores a broad array of biochemical methodologies, including purification, reconstitution, and crystallization of membrane proteins, as well as the isolation of detergent-resistant membrane fractions. Although much is now known about the thermodynamic driving forces of membrane solubilization, the kinetic pathways by which the surfactant alters vesicular mesophases are only beginning to be appreciated. Little is known about how these interactions affect the solubilization of more complex, multilamellar mesophases. Here, we investigate how a common zwitterionic detergent affects the solubilization of a smectic, multilamellar, cylindrical mesophase of lipids, called the myelin figure. Our results reveal that myelin solubilization occurs in a multistep manner, producing a well-defined sequence of morphologically distinct intermediates en route to complete solubilization. The kinetic processes producing these intermediates include (1) coiling, which encompasses the formation, propagation, and tightening of extended helices; (2) thinning, which reflects the unbinding of lamellae in the smectic stacks; and (3) detachment or retraction, which either dissociates the myelinic protrusion from the source lipid mass or returns the myelinic protrusion to the source lipid mass─all in transit toward complete solubilization. These occasionally overlapping steps are most pronounced in single-lipid component myelins, while compositionally graded multicomponent myelins inhibit the coiling step and detach more frequently. Taken together, the appearance of these intermediates during the solubilization of myelins suggests a complex free-energy landscape characterizing myelin solubilization populated by metastable, morphological intermediates correlated with locally minimized changes in energy dependent upon the mesophase's composition. This then predicts the accessibility of structurally distinct, kinetic intermediates─such as loose and tight coiled helices, peeled myelins, retracted tubes, and detached protrusions─before reaching the stable ground state corresponding to a dissolved suspension of mixed surfactant-lipid micelles.
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Affiliation(s)
- Daniel
J. Speer
- Chemistry
Graduate Group, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
| | - James C. S. Ho
- Singapore
Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
| | - Atul N. Parikh
- Chemistry
Graduate Group, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
- Singapore
Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
- Department
of Biomedical Engineering, University of
California, Davis, One Shields Avenue, Davis, California 95616, United States
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4
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Dresser L, Graham SP, Miller LM, Schaefer C, Conteduca D, Johnson S, Leake MC, Quinn SD. Tween-20 Induces the Structural Remodeling of Single Lipid Vesicles. J Phys Chem Lett 2022; 13:5341-5350. [PMID: 35678387 PMCID: PMC9208007 DOI: 10.1021/acs.jpclett.2c00704] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/31/2022] [Indexed: 05/04/2023]
Abstract
The solubilization of lipid membranes by Tween-20 is crucial for a number of biotechnological applications, but the mechanistic details remain elusive. Evidence from ensemble assays supports a solubilization model that encompasses surfactant association with the membrane and the release of mixed micelles to solution, but whether this process also involves intermediate transitions between regimes is unanswered. In search of mechanistic origins, increasing focus is placed on identifying Tween-20 interactions with controllable membrane mimetics. Here, we employed ultrasensitive biosensing approaches, including single-vesicle spectroscopy based on fluorescence and energy transfer from membrane-encapsulated molecules, to interrogate interactions between Tween-20 and submicrometer-sized vesicles below the optical diffraction limit. We discovered that Tween-20, even at concentrations below the critical micellar concentration, triggers stepwise and phase-dependent structural remodeling events, including permeabilization and swelling, in both freely diffusing and surface-tethered vesicles, highlighting the substantial impact the surfactant has on vesicle conformation and stability prior to lysis.
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Affiliation(s)
- Lara Dresser
- Department
of Physics, University of York, York YO10 5DD, U.K.
| | - Sarah P. Graham
- Department
of Physics, University of York, York YO10 5DD, U.K.
| | - Lisa M. Miller
- Department
of Electronic Engineering, University of
York, York YO10 5DD, U.K.
| | | | | | - Steven Johnson
- Department
of Electronic Engineering, University of
York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
| | - Mark C. Leake
- Department
of Physics, University of York, York YO10 5DD, U.K.
- Department
of Biology, University of York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
| | - Steven D. Quinn
- Department
of Physics, University of York, York YO10 5DD, U.K.
- York
Biomedical Research Institute, University
of York, York YO10 5DD, U.K.
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5
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Yoda T. Quality Evaluation of Drinks Based on Liposome Shape Changes Induced by Flavor Molecules. ACS OMEGA 2022; 7:5679-5686. [PMID: 35224329 PMCID: PMC8867555 DOI: 10.1021/acsomega.1c04946] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 01/27/2022] [Indexed: 05/27/2023]
Abstract
The flavors of ethyl caproate and isoamyl acetate and their precursors are crucial in sake brewing for fermentation and evaluation of the corresponding quality of drinks. However, the quality evaluation of drinks containing these flavors is challenging. Therefore, sake quality was evaluated via dynamic membrane transformation on cell-sized liposomes while adding flavor-containing solutions. Flavor varieties have been reported to influence dynamic shape change patterns. This study reports the observed difference in the dynamic shape change of each flavor. Based on these results, proper quality evaluation of drinks is expected.
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Affiliation(s)
- Tsuyoshi Yoda
- Aomori
Prefectural Industrial Technology Research Center, Hirosaki Industrial Research Institute, 1-1-8 Ougi-machi, Hirosaki
City, Aomori 036-8104, Japan
- Aomori
Prefectural Industrial Technology Research Center, Hachinohe Industrial Research Institute, 1-4-43 Kita-inter-kogyodanchi, Hachinohe City, Aomori 039-2245, Japan
- The
United Graduate School of Agricultural Sciences, Iwate University, 3-18-8,
Ueda, Morioka City, Iwate 020-8550, Japan
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6
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Yoshida K, Fujiwara N. Numerical Estimation of Acetonitrile Adsorption into Simple Artificial Cell Membranes. ChemistrySelect 2021. [DOI: 10.1002/slct.202103045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kazunari Yoshida
- Graduate School of Science and Engineering Yamagata University, 4-3-16 Jonan Yonezawa-shi Yamagata 992-8510 Japan
| | - Naofumi Fujiwara
- Graduate School of Science and Engineering Yamagata University, 4-3-16 Jonan Yonezawa-shi Yamagata 992-8510 Japan
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7
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Effects of isovaleraldehyde on cell-sized lipid bilayer vesicles. Biophys Chem 2021; 279:106698. [PMID: 34644672 DOI: 10.1016/j.bpc.2021.106698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 10/05/2021] [Indexed: 11/23/2022]
Abstract
Membrane composition and components are intrinsic properties of a cell membrane. Any changes in lipid vesicle composition or any stimuli, such as heat, that affect molecular packing induce dynamic shape change. Dynamic shape changes allow the determination of structural organization changes upon a change in the membrane internal or external environment. In this study, we report how thermal stress can affect isovaleraldehyde (IVA) flavor compound-containing membranes. We revealed that (1) IVA-containing lipid vesicles are large and their increasing size results in increasing IVA/vesicle concentration; (2) IVA-containing lipid vesicles are less thermo-responsive and are affected by increasing IVA concentration; finally, we discussed (3) the molecular mechanisms behind membrane packing. We proposed that the characteristic of IVA-containing membranes could be used in evaluating drink quality. Our results would potentially contribute to the development of membrane technology and the progress in further understanding physiological processes, such as flavor sensation.
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8
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Lin C, Katla SK, Pérez-Mercader J. Photochemically induced cyclic morphological dynamics via degradation of autonomously produced, self-assembled polymer vesicles. Commun Chem 2021; 4:25. [PMID: 36697697 PMCID: PMC9814595 DOI: 10.1038/s42004-021-00464-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/01/2021] [Indexed: 01/28/2023] Open
Abstract
Autonomous and out-of-equilibrium vesicles synthesised from small molecules in a homogeneous aqueous medium are an emerging class of dynamically self-assembled systems with considerable potential for engineering natural life mimics. Here we report on the physico-chemical mechanism behind a dynamic morphological evolution process through which self-assembled polymeric structures autonomously booted from a homogeneous mixture, evolve from micelles to giant vesicles accompanied by periodic growth and implosion cycles when exposed to oxygen under light irradiation. The system however formed nano-objects or gelation under poor oxygen conditions or when heated. We determined the cause to be photoinduced chemical degradation within hydrated polymer cores inducing osmotic water influx and the subsequent morphological dynamics. The process also led to an increase in the population of polymeric objects through system self-replication. This study offers a new path toward the design of chemically self-assembled systems and their potential application in autonomous material artificial simulation of living systems.
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Affiliation(s)
- Chenyu Lin
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
| | - Sai Krishna Katla
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
| | - Juan Pérez-Mercader
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States.
- The Santa Fe Institute, Santa Fe, NM, United States.
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9
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Morita M, Noda N. Membrane Shape Dynamics-Based Analysis of the Physical Properties of Giant Unilamellar Vesicles Prepared by Inverted Emulsion and Hydration Techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2268-2275. [PMID: 33555886 DOI: 10.1021/acs.langmuir.0c02698] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The giant unilamellar vesicle (GUV) is a basic model of the cell membrane that allows for the modulation and control of membrane shape dynamics, which play essential roles in the functions of living cell membranes. However, to properly use these artificial cell-like model systems, we need to understand their physical properties. GUV generation techniques are key technologies in the synthesis of artificial cell-like model systems. However, it is unclear whether GUVs produced by different techniques have the same physical properties. Here, we have investigated the physical properties of GUVs prepared by inverted emulsion and hydration techniques by examining the membrane shape deformation induced by external stimulation with a nonionic surfactant. We reveal differences in the spontaneous curvature of the membrane, the preferred differential area between the inner and outer leaflets of the membrane, and the edge tension of membrane pores between the GUVs prepared using the two distinct techniques.
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Affiliation(s)
- Masamune Morita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Naohiro Noda
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
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10
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Momotake A, Mizuguchi T, Hishida M, Yamamoto Y, Yasui M, Nuriya M. Monitoring the morphological evolution of giant vesicles by azo dye-based sum-frequency generation (SFG) microscopy. Colloids Surf B Biointerfaces 2019; 186:110716. [PMID: 31865122 DOI: 10.1016/j.colsurfb.2019.110716] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 11/29/2019] [Accepted: 12/07/2019] [Indexed: 11/20/2022]
Abstract
In the present work, dye-based sum-frequency generation (SFG) imaging using sodium 4-[4-(dibutylamino)phenylazo]benzenesulfonate (butyl orange, BO) as a new non-fluorescent specific azo dye is employed to monitor the morphological evolution of giant vesicles (GVs). After loading BO to the membrane of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) single-component GVs, the outermost membranes were clearly visualized using SFG microscopy, which provided images of the distinct outer and inner faces of the lipid bilayers. In addition, SFG-active vesicles were detected also inside the GVs, depending on the dye concentrations. The dye-based SFG imaging technique provided experimental evidence that these oligolamellar vesicles containing an SFG-active interior had been formed after BO loading. The formation process of the oligolamellar vesicles with inner SFG-active vesicles was successfully monitored, and their formation mechanism was discussed.
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Affiliation(s)
- Atsuya Momotake
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan.
| | - Takaha Mizuguchi
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Mafumi Hishida
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan.
| | - Yasuhiko Yamamoto
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan.
| | - Masato Yasui
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan; Keio Advanced Research Center for Water Biology and Medicine, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan.
| | - Mutsuo Nuriya
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan; Graduate School of Environment and Information Sciences, Yokohama National University, Kanagawa 240-8501, Japan; Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan; Keio Advanced Research Center for Water Biology and Medicine, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan.
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11
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Sakurai M, Kobori Y, Tachikawa T. Structural Dynamics of Lipid Bilayer Membranes Explored by Magnetic Field Effect Based Fluorescence Microscopy. J Phys Chem B 2019; 123:10896-10902. [PMID: 31769688 DOI: 10.1021/acs.jpcb.9b09782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lipid bilayer membranes are known to exist as heterogeneous and dynamic structures where the molecules are always moving and fluctuating under physiological conditions. Magnetic field effects (MFEs) studied herein are phenomena in which the exciplex emission from an electron donor-acceptor dyad increases or decreases by applying an external magnetic field. The characteristic dependence of MFEs on the viscosity and polarity of the surrounding medium has been applied to investigate the local environments around the probe molecule. In this study, a novel MFE-based fluorescence microscopy technique was developed to explore the structural dynamics of lipid bilayer membranes. The vesicle formation during the membrane deformation was selectively visualized through the MFEs, thus allowing the extraction of information on the cellular dynamics at high temporal and spatial resolutions. This highly versatile and powerful technique is applicable to a wide range of areas, such as biology and material science.
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12
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Connolly M, Zhang Y, Mahri S, Brown DM, Ortuño N, Jordá-Beneyto M, Maciaszek K, Stone V, Fernandes TF, Johnston HJ. The influence of organic modification on the cytotoxicity of clay particles to keratinocytes, hepatocytes and macrophages; an investigation towards the safe use of polymer-clay nanocomposite packaging. Food Chem Toxicol 2019; 126:178-191. [PMID: 30797875 DOI: 10.1016/j.fct.2019.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 02/04/2019] [Accepted: 02/05/2019] [Indexed: 01/27/2023]
Abstract
Organically modified clays can be used as nanofillers in polymer-clay nanocomposites to create bio-based packaging with improved strength and barrier properties. The impact of organic modification on the physico-chemical properties and toxicity of clays has yet to be fully investigated but is essential to ensure their safe use. Two organoclays, named N116_HDTA and N116_TMSA, were prepared using a commercially available sodium bentonite clay and the organic modifiers hexadecyl trimethyl ammonium bromide (HDTA) and octadecyl trimethyl ammonium chloride (TMSA). An in vitro hazard assessment was performed using HaCaT skin cells, C3A liver cells, and J774.1 macrophage-like cells. Organic modification with HDTA and TMSA increased the hazard potential of the organoclays in all cell models, as evidenced by the higher levels of cytotoxicity measured. N116_TMSA caused the greatest loss in viability with IC50 values of 3.2, 3.6 and 6.1 μg/cm2 calculated using J774.1, HaCaT and C3A cell lines, respectively. Cytotoxic effects were dictated by the amount of free or displaced organic modifier present in the exposure suspensions. The parent bentonite clay also caused distinct cytotoxic effects in J774.1 macrophage-like cells with associated TNF-α release. Such information on the hazard profile of organoclays, can feed into risk assessments for these materials.
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Affiliation(s)
- Mona Connolly
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Yu Zhang
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Sohaib Mahri
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - David M Brown
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Natalia Ortuño
- ITENE - Packaging, Transport. & Logistics Research Institute, C/ Albert Einstein, 1, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
| | - Maria Jordá-Beneyto
- ITENE - Packaging, Transport. & Logistics Research Institute, C/ Albert Einstein, 1, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
| | - Krystyna Maciaszek
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Vicki Stone
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Teresa F Fernandes
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
| | - Helinor J Johnston
- Heriot-Watt University, Riccarton Campus, Edinburgh, EH14 4AS, United Kingdom.
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13
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Ahmed S, Matsumura K, Hamada T. Hydrophobic Polyampholytes and Nonfreezing Cold Temperature Stimulate Internalization of Au Nanoparticles to Zwitterionic Liposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1740-1748. [PMID: 29936842 DOI: 10.1021/acs.langmuir.8b00920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nanomedicine relies on the effective internalization of nanoparticles combined with polymeric nanocarriers into living cells. Thus, exploration of internalization is essential for improving the efficacy of nanoparticle-based strategies in clinical practice. Here, we investigated the physicochemical internalization of gold nanoparticles (AuNPs) conjugated with hydrophobic polyampholytes into cell-sized liposomes at a low but nonfrozen temperature. The hydrophobic polyampholytes localized in the disordered phase of the membrane, and internalization of AuNPs was enhanced in the presence of hydrophobic polyampholytes together with incubation at -3 °C as compared to 25 °C. These results contribute toward a mechanistic understanding for developing a model nanomaterials-driven delivery system based on hydrophobic polyampholytes and low temperature.
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Affiliation(s)
- Sana Ahmed
- School of Materials Science , Japan Advanced Institute of Science and Technology , Nomi , Ishikawa 923-1292 , Japan
| | - Kazuaki Matsumura
- School of Materials Science , Japan Advanced Institute of Science and Technology , Nomi , Ishikawa 923-1292 , Japan
| | - Tsutomu Hamada
- School of Materials Science , Japan Advanced Institute of Science and Technology , Nomi , Ishikawa 923-1292 , Japan
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14
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Lin CC, Bachmann M, Bachler S, Venkatesan K, Dittrich PS. Tunable Membrane Potential Reconstituted in Giant Vesicles Promotes Permeation of Cationic Peptides at Nanomolar Concentrations. ACS APPLIED MATERIALS & INTERFACES 2018; 10:41909-41916. [PMID: 30450894 PMCID: PMC6420060 DOI: 10.1021/acsami.8b12217] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We investigate the influence of membrane potential on the permeation of cationic peptides. Therefore, we employ a microfluidic chip capable of capturing giant unilamellar vesicles (GUVs) in physical traps and fast exchange of chemical compounds. Control experiments with calcein proved that the vesicle membranes' integrity is not affected by the physical traps and applied shear forces. Combined with fluorescence correlation spectroscopy, permeation of fluorescently labeled peptides across vesicle membranes can be measured down to the nanomolar level. With the addition of a lipophilic ruthenium(II) complex Ru(C17)22+, GUVs consisting of mixed acyl phospholipids are prepared with a negative membrane potential, resembling the membrane asymmetry in cells. The membrane potential serves as a driving force for the permeation of cationic cell-penetrating peptides (CPPs) nonaarginine (Arg9) and the human immunodeficiency virus trans-activator of transcription (TAT) peptide already at nanomolar doses. Hyperpolarization of the membrane by photo-oxidation of Ru(C17)22+ enhances permeation significantly from 55 to 78% for Arg9. This specific enhancement for Arg9 (cf. TAT) is ascribed to the higher affinity of the arginines to the phosphoserine head groups. On the other hand, permeation is decreased by introducing an additional negative charge in close proximity to the N-terminal arginine residue when changing the fluorophore. In short, with the capability to reconstitute membrane potential as well as shear stress, our system is a suitable platform for modeling the membrane permeability of pharmaceutics candidates. The results also highlight the membrane potential as a major cause of discrepancies between vesicular and cellular studies on CPP permeation.
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Affiliation(s)
- Chao-Chen Lin
- Department of Biosystems Science and Engineering, ETH Zürich, Mattenstrasse 26, 4058 Basel, Switzerland
| | - Michael Bachmann
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Simon Bachler
- Department of Biosystems Science and Engineering, ETH Zürich, Mattenstrasse 26, 4058 Basel, Switzerland
| | - Koushik Venkatesan
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Department of Molecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia
| | - Petra S. Dittrich
- Department of Biosystems Science and Engineering, ETH Zürich, Mattenstrasse 26, 4058 Basel, Switzerland
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15
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Montis C, Till U, Vicendo P, Roux C, Mingotaud AF, Violleau F, Demazeau M, Berti D, Lonetti B. Extended photo-induced endosome-like structures in giant vesicles promoted by block-copolymer nanocarriers. NANOSCALE 2018; 10:15442-15446. [PMID: 30091780 DOI: 10.1039/c8nr04355h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Upon irradiation, the photosensitizer pheophorbide-a causes dramatic morphological transitions in giant unilamellar lipid vesicles. This endocytosis-like process occurs only when the photoactive species are encapsulated in a copolymer nanocarrier and strictly depends on the chemical nature of the copolymer. Altogether, these results open up new perspectives in the field of photo-chemical internalization mediated by nanoassemblies.
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Affiliation(s)
- C Montis
- Department of Chemistry "Ugo Schiff", University of Florence and CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino Firenze, Italy
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16
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Chabanon M, Rangamani P. Solubilization kinetics determines the pulsatory dynamics of lipid vesicles exposed to surfactant. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2032-2041. [PMID: 29572034 DOI: 10.1016/j.bbamem.2018.03.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/14/2018] [Accepted: 03/16/2018] [Indexed: 11/25/2022]
Abstract
We establish a biophysical model for the dynamics of lipid vesicles exposed to surfactants. The solubilization of the lipid membrane due to the insertion of surfactant molecules induces a reduction of membrane surface area at almost constant vesicle volume. This results in a rate-dependent increase of membrane tension and leads to the opening of a micron-sized pore. We show that solubilization kinetics due to surfactants can determine the regime of pore dynamics: either the pores open and reseal within a second (short-lived pore), or the pore stays open up to a few minutes (long-lived pore). First, we validate our model with previously published experimental measurements of pore dynamics. Then, we investigate how the solubilization kinetics and membrane properties affect the dynamics of the pore and construct a phase diagram for short and long-lived pores. Finally, we examine the dynamics of sequential pore openings and show that cyclic short-lived pores occur with a period inversely proportional to the solubilization rate. By deriving a theoretical expression for the cycle period, we provide an analytical tool to estimate the solubilization rate of lipid vesicles by surfactants. Our findings shed light on some fundamental biophysical mechanisms that allow simple cell-like structures to sustain their integrity against environmental stresses, and have the potential to aid the design of vesicle-based drug delivery systems. This article is part of a Special Issue entitled: Emergence of Complex Behavior in Biomembranes edited by Marjorie Longo.
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Affiliation(s)
- Morgan Chabanon
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla 92093, CA, USA.
| | - Padmini Rangamani
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla 92093, CA, USA.
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17
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Li J, Shi K, Drechsler M, Tang BZ, Huang J, Yan Y. A supramolecular fluorescent vesicle based on a coordinating aggregation induced emission amphiphile: insight into the role of electrical charge in cancer cell division. Chem Commun (Camb) 2018; 52:12466-12469. [PMID: 27711439 DOI: 10.1039/c6cc06432a] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Binding of Zn2+ to the coordinating supramolecular vesicle based on an aggregation induced emission amphiphile TPE-BPA immediately triggers the formation of charged vesicles. This induces vesicle fission and fluorescence reduction, suggesting a looser molecular packing in the charged vesicle membrane. Since cancer cells are highly charged, this indicates that the quick fission of cancer cells may have electrical charge origin.
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Affiliation(s)
- Jie Li
- Beijing National Laboratory for Molecular Sciences, Institution College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
| | - Kangjie Shi
- Beijing National Laboratory for Molecular Sciences, Institution College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
| | | | - Ben Zhong Tang
- Department of Chemistry, Division of Biomedical Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China. and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong, China
| | - Jianbin Huang
- Beijing National Laboratory for Molecular Sciences, Institution College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
| | - Yun Yan
- Beijing National Laboratory for Molecular Sciences, Institution College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
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18
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19
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Kushwaha S, Maity A, Gangopadhyay M, Ravindranathan S, Rajamohanan PR, Das A. Cucurbit[7]uril Induced Formation of FRET-Enabled Unilamellar Lipid Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10989-10999. [PMID: 28922602 DOI: 10.1021/acs.langmuir.7b02777] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A unique fluorescence resonance energy transfer (FRET) process is found to be operational in a unilamellar lipid self-assembly in the aqueous phase. A newly synthesized naphthyl based long chain lipid derivative [N-(naphthalene-1-ylmethyl)tetradecane-1-ammonium chloride, 14NA+] forms various self-assembled architectures in the aqueous phase. Controlled changes in lipid concentration lead to a transition of the self-assemblies from micelles to vesicles to rods. In the presence of cucurbit[7]uril (CB7), 14NA+ forms a host-guest [2]pseudorotaxane complex (CB7∋14NA+) and secondary interactions lead to the formation of a lipid bilayer with hydrophobic pockets situated in between the layers. The change in the structure of 14NA+ assemblies, interaction with CB7 and formation of supramolecular assemblies of CB7∋14NA+ were examined using light scattering, spectroscopic, and microscopic techniques. Entrapment of a luminescent dye, anthracene within the hydrophobic bilayer of the supramolecular assembly CB7∋14NA+ favors a modified luminescent response due to an efficient FRET process. Further, the FRET process could be controlled by thermal and chemical stimuli that induce transformation of unilamellar vesicles.
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Affiliation(s)
| | | | | | | | | | - Amitava Das
- CSIR-Central Salt and Marine Chemicals Research Institute , Bhavnagar 364002, India
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20
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Kobayashi D, Ouchi Y, Sadakane M, Unoura K, Nabika H. Structural Dependence of the Effects of Polyoxometalates on Liposome Collapse Activity. CHEM LETT 2017. [DOI: 10.1246/cl.161172] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Daiki Kobayashi
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560
| | - Yuya Ouchi
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560
| | - Masahiro Sadakane
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Higashi-Hiroshima, Hiroshima 739-8527
| | - Kei Unoura
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560
| | - Hideki Nabika
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560
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21
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Sugikawa K, Takamatsu Y, Yasuhara K, Ueda M, Ikeda A. Reversible Vesicle-to-Disk Transitions of Liposomes Induced by the Self-Assembly of Water-Soluble Porphyrins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1023-1029. [PMID: 28054781 DOI: 10.1021/acs.langmuir.6b02723] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Structural control of lipid membranes is important for mechanisms underlying biological functions and for creating high-functionality soft materials. We demonstrate the reversible control of vesicle structures (liposomes) using supramolecular assemblies. Specifically, water-soluble anionic porphyrin molecules interact with positively charged lipid membrane surfaces to form one-dimensional self-assembled structures (J-aggregates) under acidic conditions. Cryogenic transmission electron microscopy revealed that porphyrin J-aggregates on the membrane surface induced an extensive structural change from vesicles to layered disks. Neutralization of the solution deformed the porphyrin J-aggregates, thereby reforming nanosized liposomes from the layered disks.
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Affiliation(s)
- Kouta Sugikawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Yutaro Takamatsu
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Kazuma Yasuhara
- Graduate School of Materials Science, Nara Institute of Science and Technology , Nara 630-0192, Japan
| | - Masafumi Ueda
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Atsushi Ikeda
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
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22
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Kamiya K, Takeuchi S. Giant liposome formation toward the synthesis of well-defined artificial cells. J Mater Chem B 2017; 5:5911-5923. [DOI: 10.1039/c7tb01322a] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review focuses on microfluidic technologies for giant liposome formations which emulate environments of biological cells.
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Affiliation(s)
- Koki Kamiya
- Artificial Cell Membrane Systems Group
- Kanagawa Institute of Industrial Science and Technology
- Kawasaki
- Japan
| | - Shoji Takeuchi
- Artificial Cell Membrane Systems Group
- Kanagawa Institute of Industrial Science and Technology
- Kawasaki
- Japan
- Institute of Industrial Science
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23
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Xia Y, Charubin K, Marquardt D, Heberle FA, Katsaras J, Tian J, Cheng X, Liu Y, Nieh MP. Morphology-Induced Defects Enhance Lipid Transfer Rates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9757-9764. [PMID: 27560711 DOI: 10.1021/acs.langmuir.6b02099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Molecular transfer between nanoparticles has been considered to have important implications regarding nanoparticle stability. Recently, the interparticle spontaneous lipid transfer rate constant for discoidal bicelles was found to be very different from spherical, unilamellar vesicles (ULVs). Here, we investigate the mechanism responsible for this discrepancy. Analysis of the data indicates that lipid transfer is entropically favorable, but enthalpically unfavorable with an activation energy that is independent of bicelle size and long- to short-chain lipid molar ratio. Moreover, molecular dynamics simulations reveal a lower lipid dissociation energy cost in the vicinity of interfaces ("defects") induced by the segregation of the long- and short-chain lipids in bicelles; these defects are not present in ULVs. Taken together, these results suggest that the enhanced lipid transfer observed in bicelles arises from interfacial defects as a result of the hydrophobic mismatch between the long- and short-chain lipid species. Finally, the observed lipid transfer rate is found to be independent of nanoparticle stability.
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Affiliation(s)
| | | | - Drew Marquardt
- Institute of Molecular Biosciences, Biophysics Division, NAWI Graz, University of Graz , Graz 8010, Austria
- Department of Physics, Brock University , St. Catharines, Ontario L2S 3A1, Canada
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24
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Chen SY, Wu CY, Chen YC, Urban PL. One-Step Detection of Major Lipid Components in Submicroliter Volumes of Unpurified Liposome and Cell Suspensions. Anal Chem 2016; 88:7337-43. [DOI: 10.1021/acs.analchem.6b01740] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ssu-Ying Chen
- Department
of Applied Chemistry, National Chiao Tung University, 1001 University
Road, Hsinchu, 300, Taiwan
| | - Ching-Yi Wu
- Department
of Applied Chemistry, National Chiao Tung University, 1001 University
Road, Hsinchu, 300, Taiwan
| | - Yu-Chie Chen
- Department
of Applied Chemistry, National Chiao Tung University, 1001 University
Road, Hsinchu, 300, Taiwan
| | - Pawel L. Urban
- Department
of Applied Chemistry, National Chiao Tung University, 1001 University
Road, Hsinchu, 300, Taiwan
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25
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Antibacterial Mechanism of (−)-Nortrachelogenin in Escherichia coli O157. Curr Microbiol 2015; 72:48-54. [DOI: 10.1007/s00284-015-0918-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 08/25/2015] [Indexed: 01/06/2023]
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26
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Hyldgaard M, Mygind T, Piotrowska R, Foss M, Meyer RL. Isoeugenol has a non-disruptive detergent-like mechanism of action. Front Microbiol 2015; 6:754. [PMID: 26284043 PMCID: PMC4517379 DOI: 10.3389/fmicb.2015.00754] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 07/10/2015] [Indexed: 11/26/2022] Open
Abstract
Isoeugenol is an essential oil constituent of nutmeg, clove, and cinnamon. Despite isoeugenol's promising antimicrobial activity, no studies have yet investigated its mode of antibacterial action at the molecular level. The aim of this study is to clarify isoeugenol's antibacterial mode of action using the Gram-negative and Gram-positive model organisms Escherichia coli and Listeria innocua, respectively. We determined the antimicrobial activity of isoeugenol against the model organisms, and examined how isoeugenol affects cell morphology, cell membrane permeabilization, and how isoeugenol interacts with phospholipid membranes using vesicle and supported lipid bilayer models. Isoeugenol demonstrated a bactericidal activity against E. coli and L. innocua that did not affect cell morphology, although the cell membrane was permeabilized. We hypothesized that the cell membrane was the primary site of action, and studied this interaction in further detail using purified membrane model systems. Isoeugenol's permeabilization of calcein-encapsulated vesicles was concentration dependent, and isoeugenol's interaction with giant unilamellar vesicles indicated increased membrane fluidity and a non-disruptive permeabilization mechanism. This contradicted membrane fluidity measurements on supported lipid bilayers (SLBs), which indicated decreased membrane fluidity. However, further investigations demonstrated that the interaction between isoeugenol and bilayers was reversible, and caused membranes to display heterogeneous topography, an increased mass, and a higher degree of hydration. In conclusion, we propose that isoeugenol interacts with membranes in a reversible non-disruptive detergent-like manner, which causes membrane destabilization. Furthermore, we argue that isoeugenol increases membrane fluidity. Our work contributes to the understanding of how essential oil constituents interact with cell components.
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Affiliation(s)
- Morten Hyldgaard
- Interdisciplinary Nanoscience Center, Aarhus UniversityAarhus, Denmark
- Antimicrobials and Antioxidants, Nutrition and Health, DuPont Nutrition BiosciencesBrabrand, Denmark
| | - Tina Mygind
- Antimicrobials and Antioxidants, Nutrition and Health, DuPont Nutrition BiosciencesBrabrand, Denmark
| | - Roxana Piotrowska
- Interdisciplinary Nanoscience Center, Aarhus UniversityAarhus, Denmark
| | - Morten Foss
- Interdisciplinary Nanoscience Center, Aarhus UniversityAarhus, Denmark
| | - Rikke L. Meyer
- Interdisciplinary Nanoscience Center, Aarhus UniversityAarhus, Denmark
- Department of Bioscience, Aarhus UniversityAarhus, Denmark
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27
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Lee H, Woo ER, Lee DG. Glochidioboside Kills Pathogenic Bacteria by Membrane Perturbation. Curr Microbiol 2015; 71:1-7. [PMID: 25820208 DOI: 10.1007/s00284-015-0807-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 02/11/2015] [Indexed: 12/14/2022]
Abstract
The aim of this study was to evaluate the antibacterial effects of glochidioboside and determine its mechanism of action. Glochidioboside has been reported to be isolated from some plants but the underlying biological properties have remained largely obscure until now. To identify the antibacterial activity of all biological properties, pathogenic bacteria susceptibility test was performed, and the result shows that the compound displays remarkable antibacterial activity against antibiotic-resistant bacteria not to mention general pathogen. To demonstrate membrane disruption and depolarization, SYTOX green and bis-(1,3-dibutylbarbituric acid) trimethine oxonol were used with Escherichia coli O157, and indicated that glochidioboside affected cytoplasmic membranes by permeabilization and depolarization, respectively. Calcein efflux was evident in a membrane model that encapsulated fluorescent dye, and supported the hypothesis of a membrane-active mechanism. To confirm the release of intracellular matrix owing to membrane damage, the movements of potassium ion were observed; the results indicated that the cells treated with glochidioboside leaked potassium ion, thus the damage induced by the compounds lead to leaking intracellular components. We propose that glochidioboside kills pathogenic bacteria via perturbation of integrity of the membrane.
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Affiliation(s)
- Heejeong Lee
- School of Life Sciences, BK 21 Plus KNU Creative BioResearch Group, College of Natural Sciences, Kyungpook National University, Daehak-ro 80, Buk-gu, Daegu, 702-701, Republic of Korea
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28
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Kato N, Ishijima A, Inaba T, Nomura F, Takeda S, Takiguchi K. Effects of lipid composition and solution conditions on the mechanical properties of membrane vesicles. MEMBRANES 2015; 5:22-47. [PMID: 25611306 PMCID: PMC4384090 DOI: 10.3390/membranes5010022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 01/07/2015] [Accepted: 01/12/2015] [Indexed: 01/01/2023]
Abstract
The mechanical properties of cell-sized giant unilamellar liposomes were studied by manipulating polystyrene beads encapsulated within the liposomes using double-beam laser tweezers. Mechanical forces were applied to the liposomes from within by moving the beads away from each other, which caused the liposomes to elongate. Subsequently, a tubular membrane projection was generated in the tip at either end of the liposome, or the bead moved out from the laser trap. The force required for liposome transformation reached maximum strength just before formation of the projection or the moving out of the bead. By employing this manipulation system, we investigated the effects of membrane lipid compositions and environment solutions on the mechanical properties. With increasing content of acidic phospholipids, such as phosphatidylglycerol or phosphatidic acid, a larger strength of force was required for the liposome transformation. Liposomes prepared with a synthetic dimyristoylphosphatidylcholine, which has uniform hydrocarbon chains, were transformed easily compared with liposomes prepared using natural phosphatidylcholine. Surprisingly, bovine serum albumin or fetuin (soluble proteins that do not bind to membranes) decreased liposomal membrane rigidity, whereas the same concentration of sucrose showed no particular effect. These results show that the mechanical properties of liposomes depend on their lipid composition and environment.
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Affiliation(s)
- Nobuhiko Kato
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan.
| | - Akihiko Ishijima
- Institute of Multidisciplinary, Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan.
| | - Takehiko Inaba
- Lipid Biology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
| | - Fumimasa Nomura
- Department of Biomedical Information, Division of Biosystems, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo 101-0062, Japan.
| | - Shuichi Takeda
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan.
| | - Kingo Takiguchi
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan.
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29
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Yoshida K, Horii K, Fujii Y, Nishio I. Real-time observation of liposome bursting induced by acetonitrile. Chemphyschem 2014; 15:2909-12. [PMID: 25065500 DOI: 10.1002/cphc.201402333] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 06/22/2014] [Indexed: 01/26/2023]
Abstract
We show the bursting process of dioleoylphosphatidylcholine (DOPC) liposomes in response to the addition of acetonitrile, a small toxic molecule widely used in the fields of chemistry and industry. The percentage of destroyed liposomes is reduced upon decreasing the acetonitrile fraction in the aqueous solution and vesicle bursting is not observed at volume ratios of 4:6 and below. This indicates that a high fraction of acetonitrile causes the bursting of liposomes, and it is proposed that this occurs through insertion of the molecules into outer leaflet of the lipid bilayer. The elapsed time between initial addition of acetonitrile and liposome bursting at each vesicle is also measured and demonstrated to be dependent on the volume fraction of acetonitrile and the vesicle size.
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Affiliation(s)
- Kazunari Yoshida
- Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258 (Japan).
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30
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Yoshida K, Fujii Y, Nishio I. Deformation of Lipid Membranes Containing Photoresponsive Molecules in Response to Ultraviolet Light. J Phys Chem B 2014; 118:4115-21. [DOI: 10.1021/jp412710f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Kazunari Yoshida
- Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Yasuhiro Fujii
- Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Izumi Nishio
- Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
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31
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Morita M, Hamada T, Vestergaard MC, Takagi M. Endo- and exocytic budding transformation of slow-diffusing membrane domains induced by Alzheimer's amyloid beta. Phys Chem Chem Phys 2014; 16:8773-7. [DOI: 10.1039/c4cp00434e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cell-sized liposomes are a powerful tool for clarifying physicochemical mechanisms that govern molecular interactions.
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Affiliation(s)
- Masamune Morita
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi City, Japan
| | - Tsutomu Hamada
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi City, Japan
| | | | - Masahiro Takagi
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi City, Japan
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32
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Noguchi H. Structure formation in binary mixtures of lipids and detergents: Self-assembly and vesicle division. J Chem Phys 2013; 138:024907. [DOI: 10.1063/1.4774324] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Hamada T, Yoshikawa K. Cell-Sized Liposomes and Droplets: Real-World Modeling of Living Cells. MATERIALS 2012. [PMCID: PMC5449011 DOI: 10.3390/ma5112292] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Recent developments in studies concerning cell-sized vesicles, such as liposomes with a lipid bilayer and water-in-oil droplets covered by a lipid monolayer, aim to realize the real-world modeling of living cells. Compartmentalization with a membrane boundary is essential for the organization of living systems. Due to the relatively large surface/volume ratio in microconfinement, the membrane interface influences phenomena related to biological functions. In this article, we mainly focus on the following subjects: (i) conformational transition of biopolymers in a confined space; (ii) molecular association on the membrane surface; and (iii) remote control of cell-sized membrane morphology.
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Affiliation(s)
- Tsutomu Hamada
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi, Ishikawa 923-1292, Japan
- Authors to whom correspondence should be addressed; E-Mails: (T.H.); (K.Y.); Tel./Fax: +81-761-51-1670 (T.H.); +81-774-65-6243 (K.Y.)
| | - Kenichi Yoshikawa
- Faculty of Life and Medical Sciences, Doshisha University, 1-3, Tatara Miyakodani, Kyotanabe, Kyoto 610-0394, Japan
- Authors to whom correspondence should be addressed; E-Mails: (T.H.); (K.Y.); Tel./Fax: +81-761-51-1670 (T.H.); +81-774-65-6243 (K.Y.)
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34
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Yoda T, Vestergaard MC, Hamada T, Le PTM, Takagi M. Thermo-induced Vesicular Dynamics of Membranes Containing Cholesterol Derivatives. Lipids 2012; 47:813-20. [DOI: 10.1007/s11745-012-3695-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 06/08/2012] [Indexed: 10/28/2022]
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